package com.sbl;


import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CharacterEncodingFilter implements Filter{

    private String encoding=null;
    public void destroy() {

    }

    public void doFilter(ServletRequest req, ServletResponse resp,
                         FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse)resp;

        request.setCharacterEncoding(encoding);
        chain.doFilter(request,response);
        response.setContentType("text/html;charset=UTF-8");
    }

    //得到配置文件中的初始化参数
    public void init(FilterConfig config) throws ServletException {
        encoding = config.getInitParameter("encoding");
    }

}